PIC18C452-I/PT Equivalent & Substitute Parts

Part Overview

The PIC18C452-I/PT is an 8-bit microcontroller from Microchip Technology's PIC® 18C series, featuring 32KB OTP (One-Time Programmable) memory, 40MHz operation, and integrated peripherals including I2C, SPI, and UART connectivity. The device is classified as obsolete, making substitute parts necessary for new designs and production continuity. The PIC18F4520-I/PT serves as the manufacturer-recommended upgrade path, offering enhanced capabilities while maintaining core compatibility.

Substiute Parts

PIC18C452-I/PT

Microchip TechnologyIn Stock: 1170PIC18C452-I/PT Datasheet

Current PartRFQ

PIC18F4520-I/PT

Microchip TechnologyIn Stock: 1973PIC18F4520-I/PT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC18C452-I/PT is determined by the following critical parameters:

Mandatory Compatibility Parameters:

• Core processor architecture (PIC)
• Core size (8-Bit)
• Operating frequency (40MHz)
• Program memory capacity (32KB)
• Package type (44-TQFP)
• Voltage supply range (4.2V ~ 5.5V)
• Operating temperature range (-40°C ~ 85°C)

Allowable Variations:

• Program memory type (OTP to FLASH)
• Number of I/O pins (33 to 36)
• EEPROM availability (none to 256 x 8)
• Data converter channels (8x10b to 13x10b)
• Peripheral enhancements (LVD to HLVD)

The PIC18F4520-I/PT qualifies as a direct substitute based on identical core architecture, frequency, memory capacity, package, voltage, and temperature specifications. The transition from OTP to FLASH memory represents an enhancement, not a limitation.

Parameter Comparison

Engineering Selection Recommendations

The PIC18C452-I/PT is obsolete and no longer in active production. The PIC18F4520-I/PT is the manufacturer-recommended substitute and is currently in active production status.

Selection Basis:

The PIC18F4520-I/PT maintains full compatibility with the PIC18C452-I/PT across all critical electrical and mechanical parameters. Both devices are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The transition from OTP to FLASH memory in the PIC18F4520-I/PT provides superior programmability for development and production environments without compromising any functional specifications.

The identical 44-TQFP package, voltage supply range, operating temperature range, and core frequency ensure direct PCB-level compatibility. The enhanced I/O count (36 vs. 33) and additional EEPROM capacity (256 x 8) represent functional improvements that do not create backward compatibility issues.

Frequently Asked Questions (FAQ)

Q: Can the PIC18F4520-I/PT be used as a direct replacement for the PIC18C452-I/PT?

A: Yes. Both devices share identical core architecture, operating frequency (40MHz), program memory capacity (32KB), package type (44-TQFP), voltage supply range (4.2V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). The devices are pin-compatible and electrically compatible at the system level.

Q: What are the key differences between these two parts?

A: The primary differences are program memory type (OTP vs. FLASH), I/O pin count (33 vs. 36), and EEPROM availability (none vs. 256 x 8). The PIC18F4520-I/PT offers enhanced programmability and additional peripheral resources.

Q: Are there any package or mounting differences?

A: No. Both devices use the 44-TQFP (10x10) surface mount package with identical pinout and mechanical specifications.

Q: Why is the PIC18C452-I/PT obsolete?

A: The PIC18C series with OTP memory has been superseded by the PIC18F series with FLASH memory, which offers superior flexibility for development, prototyping, and production environments.

Q: What compliance certifications apply to the PIC18F4520-I/PT?

A: The PIC18F4520-I/PT is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: Are there any firmware or software compatibility considerations?

A: Code written for the PIC18C452-I/PT will execute on the PIC18F4520-I/PT without modification, provided the application does not depend on OTP-specific programming characteristics.